Ergonomic writing instrument



FIG. 1 is a perspective view of a first embodiment of my invention;

FIG. 2 is another perspective view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a bottom plan view thereof;

FIG. 5 is a left side elevation view thereof;

FIG. 6 is a right side elevation view thereof;

FIG. 7 is a front elevation view thereof;

FIG. 8 is a back elevation view thereof;

FIG. 9 is a perspective view of a second embodiment of my invention;

FIG. 10 is a another perspective view thereof;

FIG. 11 is a top plan view thereof;

FIG. 12 is a bottom plan view thereof;

FIG. 13 is a right side elevation view thereof;

FIG. 14 is a left side elevation view thereof;

FIG. 15 is a front elevation view thereof; and,

FIG. 16 is a back elevation view thereof.

The broken line showings in FIGS. 1-16 are for illustrative purposes only and form no part of the claimed design. 

The ornamental design for an ergonomic writing instrument, as shown and described. 